2020金鹰节在线观看

视频简介

NOVA: Mysteries of Sleep Like virtually every other animal, humans need sleep to survive. But why? What do we gain from spending nearly a third of our lives in such a defenseless state? And what's at stake if we sleep poorly? The functions of sleep have long been something of a mystery. But now scientists are peering deep into the brain to see what happens while we snooze. One ...。一个年轻人想成为鸟，在一位天使的帮助下，造了一对翅膀，达到了可以飞翔的目的. . .。